Door-frame for air-tight doors.



Patented July 18, 1905.

PATENT OEEICE.

SAMUEL PRICE STEVENSON, OE CHESTER, PENNSYLVANIA.

DOOR-FRAME FOR AIR-TIGHT DOORS..

SPECIFICATION forming part of Letters Patent No. 794,953, dated July 18,1905.

i Application filed June 27,1903. Serial No. 163,405.

To all whom, t may concern:

Be it known that I, SAMUEL PRICE STE- vENsoN, a citizen of .the UnitedStates, residing at Chester, in the county of Delaware and State ofPennsylvania, have invented certain new and useful improvements inDoor-Frames for Air-Tight Doors, of which the following is aspecification.

This invention relates to door-frames for air-tight doors, and moreparticularly applicable to those used for cold-storage apartments, andhas for its object the providing as a commerciall article of manufacturesuch door-frames of greater durability and improved facility of entranceand exit with objects or commodities to be stored with the briefestduration of opening of the door.

To this end this invention consists in animproved construction of frameand casing combined with a specially formed and attached construction ofsill and threshold, to which doors are readily applied with airtightclosure and which aord a firm and durable support for the hinges of thedoor, such frames being made and shipped complete as articles ofmanufacture and applicable without alteration to the doorway-openings ofair-tight apartments. The construction of this door-frame is shown inthe accompanying drawings, in which- Eigure l shows a front elevation ofa doorfraine embodying my invention; Fig. 2., aside elevation; Fig. 3,an inverted ground plan; Fig. 4, a top view; Fig. 5, a vertical section,and Eig. 6 a horizontal section in the plane fc ff; in Fig. l.

The door and hinges are shown in dotted lines in Fig. 1.

Referring to the drawings, 1 and l' are door-jainbs.

2 is a lintel, and 3 the sill with an inclined threshold 4, formedintegrally therewith in front of the door. The sill 3 is fitted betweenthe lower ends of the jambs l and l', and the casings 5 also extendbelow the upper surface of the sill 3 and are secured betweenprojections 6, formed on the sill and threshold. The front edge of thethreshold is of such thickness as when let into the floor as to leavethe base 7 of the inclined surface 4 Hush with upper surface of thefloor 8. rIhe casings 5, being held in the manner above described, arewell adapted to support the pivots of the extended hinges 9, upon whichthe door lO is hung. The upper ends of the jambs 1 and l' are preferablytongued and grooved into the lintel 2.

By reason of the thickness of the front edge 7 of the sill 3, formingthe threshold, it is stronger and well adapted to endure handlingwithout injury in transportation and when erected to stand the impact ofWheeled trucks entering and leaving the air-tight chamber andeffectually clears the lower edge of the door lO when open.

Door-frames as thus constructed are easily erected in thedoorway-openings of air-tight apartments and are sufficiently flexiblein torsional directions to be readily sprung into wind to conform to anywinding or twisting of the door to be used in conjunction therewith andwhen so sprung may be held in place by nailing fillet-strips to abutagainst the inner edges of the frame. The sill furnishes a firm bracingand support for the jambs 11 and casing 5.

Having described my invention, what I claim is- In a door-frame forair-tight apartments of refrigerating and like buildings, thecombination of a threshold having a sill integral therewith and providedwith lateral extensions projecting beyond the doorway at the front, oropening face thereof; extended casings projecting below the uppersurface of said threshold and secured against the rear faces of theprojecting portions thereof; jambs extending below the upper surface ofthe threshold and secured to the ends thereof in rear of said casings;and a lintel connecting said jambs and casings at the upper extremity ofthe doorway, substantially as set forth.

S. PRICE STEVEN SON. i/Vitnesses:

IRA STOVER MYERS, S. HORACE MYERS.

